BMS 18N850 4 Ohms
Thiele-Small parameters
| Nominal size | 18" |
|---|---|
| Impedance | 4 Ω |
| Fs | 23.7 Hz |
| Qts | 0.261 |
| Qes | 0.27 |
| Qms | 7.45 |
| Vas | 288 L |
| Sd | 1212 cm² |
| Xmax | 11 mm |
| Re | 3 Ω |
| Bl | 23.1 T·m |
| Mms | 322.4 g |
| Pe | 1200 W |
| Sensitivity | 97.8 dB |
Alignment hint
| EBP | 88 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 45.4 L |
EBP 50-100: works in either a sealed or ported alignment.
Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.
Substitute candidates
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| BMS 18N850 8 Ohms | 24.4 +0.7 | 0.251 -0.01 | 288 = | 10.6 -0.4 | 95.5 -2.3 | close | 8 Ω vs 4 Ω: amp load changes · Xmax 10.6 mm < 11 mm: lower excursion-limited SPL | + |
| Oberton 18NSW700 | 30.48 +6.78 | 0.243 -0.02 | 309.02 +21.02 | 14 +3 | 97.5 -0.3 | usable | 8 Ω vs 4 Ω: amp load changes · 700 W vs 1200 W: lower power handling | + |
| RCF LF 18X401 | 30 +6.3 | 0.298 +0.04 | 274 -14 | 11.4 +0.4 | 97.5 -0.3 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF18X401 | 30 +6.3 | 0.3 +0.04 | 274 -14 | 12 +1 | 97.5 -0.3 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF18Y402 | 30 +6.3 | 0.3 +0.04 | 274 -14 | 12 +1 | 97.5 -0.3 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF18X400 | 28 +4.3 | 0.27 +0.01 | 340 +52 | 9 -2 | 97.5 -0.3 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 9 mm < 11 mm: lower excursion-limited SPL | + |
| Faital PRO 18XL2000 | 28 +4.3 | 0.27 +0.01 | 232.1 -55.9 | 16.32 +5.32 | 97 -0.8 | usable | 8 Ω vs 4 Ω: amp load changes | + |
| 18 Sound 18NLW9400 | 33 +9.3 | 0.26 = | 268 -20 | 9.5 -1.5 | 98 +0.2 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 9.5 mm < 11 mm: lower excursion-limited SPL | + |
| BMS 18N840V2 | 28.5 +4.8 | 0.314 +0.05 | 288 = | 10 -1 | 97.1 -0.7 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 10 mm < 11 mm: lower excursion-limited SPL | + |
| RCF LF 18X400 v2 | 28 +4.3 | 0.278 +0.02 | 340 +52 | 9 -2 | 98 +0.2 | usable | 8 Ω vs 4 Ω: amp load changes · Xmax 9 mm < 11 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the 18N850 4 Ohms →
Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.
Used in enclosures (0)
No enclosure in the catalog uses this driver yet.